Hua Shan Visit.

1. One night is enough for climbing it and in the next early monrning, you can watch the sunrise. Yuntai Hotel, West Peak Hotel and East Peak Hotel are suggested for you.
2. You can climb according to your own situation. If you are not tired, it is better to climb all the peaks. If you are tired, you can choose to climb some of them.
3. For the time of climbing, it generally takes 4-5 hours.
4. Actually, you can take the cable car both for abscending and descending if you like.
4. In my opinion, it is dangerous to climb these places, especially Black Dragon Riage when going down. You can find more information on https://www.travelchinaguide.com/attraction/shaanxi/xian/mt_huashan.htm. On this webpage, more information are introduced to you and you may know how dangerous it is to climb the mountain.
6. It is the good time to visit Xian and the mountain at that time. If you can, it is suggested to go in Sep. Well, it would be warm then, with the average temp of about 15C. While on the top of the mountain, you may need a down jacket. Also it may rain a little. So it is suggested to pay attention to the weather forecast before traveling.

Thank you very much for your reply. It helps me a lot to determine what I want to do.
Thank you again.